750/x=25/100
750x100=75,000
75,000/25= 3,000
75,000+3,000= 78,000
52.20÷3= 17.40×5=87. The meal cost £87
The inverse is:

Further explanation:
Given function

<u>Step 1: Replacing f(x) with y</u>

<u>Step 2: Replacing x with y and y with x</u>

<u>Step 3: Solving the equation for y</u>

<u>Step 4: Replacing y with f-1(x)</u>

So, the inverse is:

Keywords: Functions, Inverse of function
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